/* Copyright (c) 2009 Christopher Humphries, Maxime Simon
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package history;

import java.util.ArrayList;
import java.util.List;

/**
 * @author Humphries Christopher - Simon Maxime
 * 
 */
public class Caretaker {

    private List<Object> m_savedStates = new ArrayList<Object>();
    private int m_currentIndex;

    /**
     * @return
     */
    public int getCurrentIndex() {
	return m_currentIndex;
    }

    /**
     * @param m
     * @return
     */
    public int addMemento(Object m) {
	if (m_currentIndex < m_savedStates.size() - 1) {
	    m_currentIndex++;
	    m_savedStates.add(m_currentIndex, m);
	} else {
	    m_savedStates.add(m);
	    m_currentIndex = m_savedStates.size() - 1;
	}

	return m_currentIndex;
    }

    /**
     * @param index
     * @return
     */
    public Object getMemento(int index) {
	Object ret = new Object();

	try {
	    ret = m_savedStates.get(index);
	    m_currentIndex = index;
	} catch (IndexOutOfBoundsException e) {
	    System.out.println("Error on memento restore! \nindex: " + index
		    + "\nMax: " + (m_savedStates.size() - 1));
	}

	return ret;
    }

    /**
     * 
     */
    public void reset() {
	m_savedStates = new ArrayList<Object>();
	m_currentIndex = 0;
    }

    /**
     * 
     */
    public Caretaker() {
	m_currentIndex = 0;
    }
}
